GSM Control PanelStandby current more than 55mAAlarming current more than 450mAWireless frequency 433MHzGSM frequency 850 / 900 / 1800 / 1900MHzSensors can store max 99 wireless sensorsRemote controllers can store max 8 wireless remotesWired sensor can connnect max 7 wired sensorsBack – up battery can last 4 hours when power cut offSiren only support one wired siren OR more wireles sirens but with same transmitter